Agricultural chemical composition

Abstract: A method for enhancing the effectiveness of an agricultural chemical which comprises incorporating a specific enhancer into a diluted solution of the agricultural chemical. The specific enhancer is a quaternary ammonium salt or a tertiary amine or a salt thereof containing one or more carboxylic acid ester or amide groups, at least one long chain alkyl or alkenyl group and optionally also ether groups.

Description: Background of the Invention Field of the Invention The present invention relates to a method for enhancing the effectiveness of an agricultural chemical, a novel agricultural chemical composition containing a specific enhancer and a use of an enhancer for the preparation of the agricultural chemical composition. Description of the Related Art Agricultural chemicals including insecticides, fungicides (or bactericides), herbicides, miticides (or acaricides) and plant growth regulators have been used in the forms of, for example, emulsions, wettable powders, granules, powders and flowables. In the properties of these agricultural chemical preparations, various attempts have been made to achieve the maximum effectiveness of the agricultural chemicals. However, it has been difficult to enhance the effectiveness of agricultural chemicals through adjustments in formulations. It is further difficult to develop novel agricultural chemicals. Therefore, further enhancement of existing agricultural chemicals would highly contribute to the industry. As substances capable of enhancing agricultural chemicals, surfactants comprising various nitrogen-containing compounds such as quaternary ammonium salts, betaines and amine oxides have been known (see European Patent Publication-A No. 274369, published on July 13, 1988). It is known that quaternized or further polyoxyethylenated long-chain amines, among the above-mentioned compounds, are effective for this purpose. However, the enhancement effect of the above described compounds capable of enhancing agricultural chemicals is not always satisfied. WO 91/16024 discloses cationic lipids which assist the penetration of bioactive agents into cells such as plant cells and compositions containing the cationic lipids with the bioactive agents. US-A 4,883,917 discloses quaternary ammonium compounds and especially tetradecyl dimethyl 2-methoxyethyl ammonium chloride and their use as fungicides, algicides, bactericides and bleach activators. JP 2169554 refers to specific unsaturated aliphatic carboxylic acid derivatives and their use as phytopathogenic fungicides. JP 81039168 discloses quaternary ammonium compounds containing organic groups being used as additives for silkworm feedstuff. EP 509 346 discloses quaternary ammonium salts being useful as activators for agricultural chemicals. The compositions may contain surfactants such as non-ionic surfactants. Disclosure of the Invention Summary of the Invention From the viewpoint that the effectiveness of the agricultural chemicals can be enhanced by the combined use of agricultural chemicals with quaternary ammonium salts or amines, the present inventors have conducted extensive studies. As a result, they have found that specific quaternary ammonium salts and amines are particularly effective in enhancing the effectiveness of various agricultural chemicals, thus completing the present invention. Thus, the present invention provides an agricultural chemical composition comprising an agricultural chemical and an effective amount for enhancing the effectiveness of the agricultural chemical of an enhancer compound selected from the group consisting of compounds represented by the following formulae (B) to (F): wherein R 1b and R 2b may be the same or different from each other and each represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group, preferably an alkyl group having 1 to 4 carbon atoms; R 3b and R 4b may be the same or different from each other and each represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group; each of R 5b s and R 6b s represents a hydrogen atom or a methyl group; t and u may be the same or different from each other and each represents a positive number of from 1 to 5; and v and w may be the same or different from each other and each represents a number of from 0 to 30, wherein R 7c and R 8c may be the same or different from each other and each represents an alkyl group having 1 to 4 carbon atoms; R 9c represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms, preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; R 10c and R 11c may be the same or different from each other and each represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group; each of R 12c s and R 13c s represents a hydrogen atom or a methyl group; j and k may be the same or different from each other and each represents a positive number of from 1 to 5; r and s may be the same or different from each other and each represents a number of from 0 to 30; and X - represents a counter ion, wherein R 1d represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 2d represents a linear or branched alkyl or alkenyl group having 1 to 36 carbon atoms, preferably 5 to 36 carbon atoms, which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4d (wherein R 4d represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5d represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6d s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7d represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8d s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); and R 3d represents a group represented by the formula: (wherein R 9d represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 10d s represents a hydrogen atom or a methyl group, G 3 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, h represents a positive number of 2 to 6, i represents a positive number of 1 to 5, and x represents a number of 0 to 30) or a group represented by the formula: (wherein R 11d represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 12d s represents a hydrogen atom or a methyl group, y represents a positive number of 1 to 5, and z represents a number of 0 to 30), wherein R e represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group, preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 1e represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 2e represents a linear or branched alkyl or alkenyl group having 1 to 36 carbon atoms, preferably 5 to 36 carbon atoms, which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4e (wherein R 4e represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5e represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6e s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7e represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8e s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); R 3e represents a group represented by the formula: (wherein R 9e represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 10e s represents a hydrogen atom or a methyl group, G 3 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, h represents a positive number of 2 to 6, i represents a positive number of 1 to 5, and x represents a number of 0 to 30) or a group represented by the formula: (wherein R 11e represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 12e s represents a hydrogen atom or a methyl group, y represents a positive number of 1 to 5, and z represents a number of 0 to 30); and X - represents a counter ion, and wherein R 13f represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group, preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 14f represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 15f represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group; R 16f represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group; d is a positive number of 1 to 5; and X - is a counter ion. Examples of the counter ion include a halide ion such as Cl - , Br - and I - , an alkylsulfate anion (RSO 4 - ), an alkylbenzenesulfonic acid anion (R-benzene-SO 3 - ), an alkylnaphthalenesulfonic acid anion (R-naphthalene-SO 3 - ), a fatty acid anion (RCOO - ), an alkylphosphate anion (ROPO 3 H - ) (wherein R represents an alkyl group), an anionic oligomer and an anionic polymer. Further, the present invention provides a method for enhancing the effectiveness of an agricultural chemical which comprises applying an enhancer compound selected from the group consisting of compounds represented by the above formulae (B) to (F) with an agricultural chemical to a locus which would benefit from such treatment. In this method, the enhancer compound and the agricultural chemical are generally diluted with water or a liquid carrier. Examples of the locus or the area to be treated include farm, plantation, fruit garden, orchard, flower garden, lawn, wood and forest. Examples of the locus include, further, plants, crops such as cereals, vegetables and fruits, trees, fruit trees, grasses, weeds, seeds, fungi, bacteria, insects, acarids and mites. Furthermore, the present invention provides a use of an enhancer compound selected from the group consisting of compounds represented by the above formulae (B) to (F) for the preparation of an agricultural chemical composition. In addition, the present invention provides an agricultural chemical kit which comprises a container containing the enhancer compound described above and a container containing an agricultural chemical composition; another agricultural chemical kit which comprises a container containing the enhancer described above and a surfactant other than the compounds represented by the above formulae (B) to (F) and a container containing an agricultural chemical composition. In this specification, the term "agricultural chemical" means one which is employed as an active or principle ingredient in common agricultural chemical compositions or preparations, and examples thereof include a fungicide (or a bactericide), an insecticide, a miticide (or an acaricide), a herbicide, a plant growth regulator and the like. Further the scope and the applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples which follow, while indicating preferred embodiments of the invention, are given by way of illustration only. Detailed Description of the Invention In the present invention, compounds represented by the above formulae (B) to (F) are used as enhancers for agricultural chemicals. The compound of the formula (B) according to the present invention may be obtained by reacting 3-chloropropane-1,2-diol with dimethylamine to dehydrochlorinate, neutralizing and purifying the obtained product to thereby give dimethylaminopropane-1,2-diol and esterifying this compound by reacting it with polyoxyethylene ether carboxylic acid. It is needless to say that the method for preparing the compound of the formula (B) according to the present invention is not restricted thereto. In the formula (B), it is preferable that R 1b and R 2b are each a methyl group, R 3b and R 4b are each an alkyl or alkenyl group having 4 to 22 carbon atoms, t and u are each from 1 to 3, and v and w, which represent each the average addition mole number of the alkylene oxide, are each from 0 to 20. Furthermore, in the above case, v and w are each still more preferably from 1 to 15, and the total number of v and w is preferably from 2 to 30. The formula (B) represents also a mixture of compounds which are different from one another the addition mole number of the alkylene oxide and/or the kind of the alkylene oxide to be added, in addition to a single compound. When the single compound or the compounds which are composed of the mixture has(have) two or more R 5b s (or R 6b s), the R 5b s (or R 6b s) may be the same or different from one another. In other words, the alkylene oxide to be added is ethylene oxide, propylene oxide or a mixture of ethylene oxide with propylene oxide. The compound of the formula (C) according to the present invention may be obtained by quaternizing the compound represented by the above formula (B) with, for example, an alkyl chloride. It is needless to say that the method for preparing the compound of the formula (C) according to the present invention is not restricted thereto. In the above formula (C), it is preferable that R 7c and R 8c are each a methyl group, R 9c is a methyl, ethyl or benzyl group, R 10c and R 11c are each an alkyl or alkenyl group having 4 to 22 carbon atoms, j and k are each from 1 to 3, and r and s, which represent each the average addition mole number of the alkylene oxide, are each from 0 to 20. Furthermore, in the above case, it is still more preferable that R 9c is a methyl or ethyl group, r and s are each from 1 to 15, and the total number of r and s is from 2 to 30. The formula (C) represents also a mixture of compounds which are different from one another the addition mole number of the alkylene oxide and/or the kind of the alkylene oxide to be added, in addition to a single compound. When the single compound or the compounds which are composed of the mixture has(have) two or more R 12c s (or R 13c s), the R 12c s (or R 13c s) may be the same or different from one another. In other words, the alkylene oxide to be added is ethylene oxide, propylene oxide or a mixture of ethylene oxide with propylene oxide. Among the compounds of the formula (D) according to the present invention, an amine of a diester type can be obtained by, for example, reacting monochloroacetic acid with a polyoxyethylene alkyl ether to thereby effect esterification and then reacting the chloroester compound thus obtained with methylamine to dehydrochlorinate. An amine of a diester type wherein one of functional groups is in the reverse direction may be obtained by, for example, reacting 2-chloroethanol with polyoxyethylene ether carboxylic acid to thereby effect esterification, reacting the chloroester compound thus obtained with methylamine to dehydrochlorinate, and then reacting the amine ester compound thus obtained with, for example, a chloroester compound obtained from monochloroacetic acid and a polyoxyethylene alkyl ether to dehydrochlorinate. An amine of another diester type may be obtained by, for example, reacting diethanolmethylamine with polyoxyethylene ether carboxylic acid to thereby effect esterification. An amine of an ester amide type may be obtained by, for example, reacting N-hydroxyethyl-N-methylpropanediamine with polyoxyethylene ether carboxylic acid to thereby effect esterification and amidation. An amine of a diamide type may be obtained by, for example, reacting 3,3'-diamino-N-methyldipropylamine with polyoxyethylene ether carboxylic acid to thereby effect amidation. An amine of an alkyl ester type may be obtained by, for example, reacting chlorododecane with methylamine to thereby effect dehydrochlorination and then reacting the secondary amine compound thus obtained with a chloroester compound to thereby effect dehydrochlorination. An amine of an alkylamide type may be obtained by, for example, reacting N-ethyl-ethylenediamine with polyoxyethylene ether carboxylic acid to thereby effect amidation and then reacting the aminoamide compound thus obtained with an alkyl chloride to thereby effect dehydrochlorination. The compound of the formula (E) according to the present invention can be obtained by, for example, quaternizing a compound of the formula (D) with an alkyl chloride. The compound of the formula (F) according to the present invention can be obtained by, for example, reacting dimethyldodecylamine with a chloroester compound to thereby effect quaternization and then substituting a secondary amino group for the alcoholic hydroxyl group in the ester quaternary ammonium salt compound thus obtained by reacting said compound with, for example, dodecylamine to thereby effect amidation. It is needless to say that methods for the preparation of the compounds of the formulae (D), (E) and (F) according to the present invention are not restricted to those cited above. Among the compounds of the formula (D) according to the present invention, preferable ones are those wherein R 1d is a methyl, ethyl or hydroxyethyl group, R 2d is an alkyl group having 1 to 22 carbon atoms provided that it represents an alkyl group, R 4d is an alkyl group having 7 to 21 carbon atoms, R 5d and R 11d are each an alkyl group having 8 to 22 carbon atoms, R 7d and R 9d are each an alkyl group having 4 to 22 carbon atoms, c, g, x and z, which represent each the average addition mole number of the alkylene oxide, are each a number of 0 to 20, a, e and h are each a number of from 2 to 4, and b, f, i and y are each a number of from 1 to 3. Furthermore, in the above case, it is still more preferable that R 2d is an alkyl group having 8 to 22 carbon atoms, and c, g, x and z are each a number of 1 to 15. The formula (D) represents also a mixture of compounds which are different from one another the addition mole number of the alkylene oxide and/or the kind of the alkylene oxide to be added, in addition to a single compound. When the single compound or the compounds which are composed of the mixture has(have) two or more R 6d s (or R 8d s, R 10d s or R 12d s), the R 6d s (or R 8d s, R 10d s or R 12d s) may be the same or different from one another. In other words, the alkylene oxide to be added is ethylene oxide, propylene oxide or a mixture of ethylene oxide with propylene oxide. Among the compounds of the formula (E) according to the present invention, preferable ones are those wherein R e is a hydrogen atom, an alkyl group having 1 to 2 carbon atoms or a benzyl group, R 1e is a methyl, ethyl or hydroxyethyl group, R 2e is an alkyl group having 1 to 22 carbon atoms provided that it represents an alkyl group, R 4e is an alkyl group having 7 to 21 carbon atoms, R 5e and R 11e are each an alkyl group having 8 to 22 carbon atoms, R 7e and R 9e are each an alkyl group having 4 to 22 carbon atoms, c, g, x and z, which represent each the average addition mole number of the alkylene oxide, are each a number of 0 to 20, a, e and h are each a number of from 2 to 4, and b, f, i and y are each a number of from 1 to 3. Further, still more preferable ones are those wherein R e is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, R 1e is a methyl, ethyl or hydroxyethyl group, R 2e is an alkyl group having 8 to 22 carbon atoms provided that it represents an alkyl group, R 4e is an alkyl group having 7 to 21 carbon atoms, R 5e and R 11e are each an alkyl group having 8 to 22 carbon atoms, R 7e and R 9e are each an alkyl group having 4 to 22 carbon atoms, c, g, x and z, which represent each the average addition mole number of the alkylene oxide, are each a number of 1 to 15, a, e and h are each a number of from 2 to 4, and b, f, i and y are each a number of from 1 to 3. The formula (E) represents also a mixture of compounds which are different from one another the addition mole number of the alkylene oxide and/or the kind of the alkylene oxide to be added, in addition to a single compound. When the single compound or the compounds which are composed of the mixture has(have) two or more R 6e s (or R 8e s, R 10e s or R 12e s), the R 6e s (or R 8e s, R 10e s or R 12e s) may be the same or different from one another. In other words, the alkylene oxide to be added is ethylene oxide, propylene oxide or a mixture of ethylene oxide with propylene oxide. Among the compounds of the formula (F) according to the present invention, preferable ones are those wherein R 13f is a hydrogen atom, an alkyl group having 1 to 2 carbon atoms or a benzyl group, R 14f is a methyl, ethyl or hydroxyethyl group, and R 15f and R 16f are either the same or different from each other and each represents an alkyl group having 8 to 22 carbon atoms, and still more preferable ones are those wherein R 13f is a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, R 14f is a methyl, ethyl or hydroxyethyl group, and R 15f and R 16f are either the same or different from each other and each represents an alkyl group having 8 to 22 carbon atoms . When used together with an agricultural chemical, the enhancer for agricultural chemicals according to the present invention, i.e., the compound represented by any of the above formulae (B) to (F), can enhance the effectiveness of the agricultural chemical twice or thrice without causing any phytotoxicity. Namely, the enhancer for agricultural chemicals of the present invention can be safely applied to various crops without causing any phytotoxicity. It has not necessarily been clarified why the enhancer for agricultural chemicals comprising any of the compounds represented by the formulae (B) to (F) according to the present invention exerts a remarkable enhancement effect regardless of the type of the structure of the agricultural chemical. One of the reasons therefor seemingly resides in that the enhancer of the present invention exerts a very strong solubilizing power on an agricultural chemical and, therefore, improves the wettability and permeability of the agricultural chemical, or promotes the penetration of the agricultural chemical into insects, fungi and bacteria. The combined use of at least one member selected from the group consisting of the compounds represented by the formulae (B) to (F) according to the present invention with surfactant(s) other than these compounds makes it possible to reduce the dose of the compound(s) represented by the formulae (B) to (F) while maintaining their enhancement effect on agricultural chemicals. As surfactants other than the compounds represented by the formulae (B) to (F), nonionic surfactants, anionic surfactants, cationic surfactants, ampholytic surfactants and mixtures of two or more surfactants described above are useful. Examples of the nonionic surfactants include polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene alkylaryl ether/formaldehyde condensates, polyoxyalkylene aryl ethers, polyoxyalkylene alkyl esters, polyoxyalkylene alkylsorbitol esters, polyoxyalkylene sorbitan esters, polyoxyalkylene alkylglycerol esters, polyoxyalkylene block copolymers, polyoxyalkylene block copolymer/alkylglycerol esters, polyoxyalkylene alkylsulfonamides, polyoxyalkylene rosin esters, polyoxypropylene block copolymers, polyoxyethylene oleyl ethers, polyoxyalkylene alkylphenols, alkylglycosides, alkylpolyglycosides, polyoxyalkylene alkylpolyglycosides, and mixtures comprising two or more of these surfactants. Examples of the cationic surfactants include alkylamine/ethylene oxide adducts and alkylamine/propylene oxide adducts such as tallow amine/ethylene oxide adduct, oleylamine/ethylene oxide adduct, soy amine/ethylene oxide adduct, coco amine/ethylene oxide adduct, synthetic alkylamine/ethylene oxide adducts, octylamine/ethylene oxide adduct and mixtures thereof. Among anionic surfactants, typical ones are available in the form of an aqueous solution or a solid. Examples thereof include sodium mono- and dialkylnaphthalenesulfonates, sodium α-olefinsulfonate, sodium alkanesulfonates, alkylsulfosuccinates, alkylsulfates, polyoxyalkylene alkyl ether sulfates, polyoxyalkylene alkyl aryl ether sulfates, polyoxyalkylene styryl phenyl ether sulfates, mono- and dialkylbenzenesulfonates, alkylnaphthalenesulfonates, alkylnaphthalenesulfonate/formaldehyde condensates, alkyl diphenyl ether sulfonates, olefinic sulfonates, mono- and dialkylphosphates, polyoxyalkylene mono- and dialkylphosphates, polyoxyalkylene mono- and diphenyl ether phosphates, polyoxyalkylene mono- and dialkyl phenyl ether phosphates, polycarboxylic acid salts, fatty acid salts, linear and branched alkyl polyoxyalkylene ether acetic acids and salts thereof, linear and branched alkenyl polyoxyalkylene ether acetic acids and salts thereof, stearic acid and its salts, oleic acid and its salts, N-methyl fatty acid taurides and mixtures comprising two or more of these surfactants (including sodium, potassium, ammonium and amine salts). Examples of suitable ampholytic surfactants include lauryldimethylamine oxide, Armox C/12, amine oxides, Monaterics, Miranols, betaines, Lonzaines, other amine oxides and mixtures thereof. Among these surfactants, nonionic surfactants are particularly preferable. Still more preferable surfactants include those of the ester type, such as polyoxy-alkylene sorbitan esters and polyoxyalkylene alkyl glycerol esters, polyoxyalkylene alkyl ethers and polyoxyalkylene alkylphenyl ethers. In an enhancer (or an enhancer composition) for agricultural chemicals comprising the compound(s) represented by the above formulae (B) to (F) and surfactant(s) other than said compounds, the weight ratio of the content of the compound(s) represented by the above formulae (B) to (F) to the content of the surfactant(s), i.e., [the (total) content of the compound(s) represented by the above formulae (A) to (F)/the (total) content of the surfactant(s) other than said compounds], preferably ranges from 1/10 to 50/1, still more preferably from 1/1 to 10/1. The agricultural chemical composition of the present invention comprises the above-mentioned enhancer and an agricultural chemical. In the agricultural chemical composition comprising the enhancer and an agricultural chemical according to the present invention, it is necessary to use the compound(s) represented by the general formulae (B) to (F), i.e., the enhancer, in an amount wherein the weight ratio of the (total) content of the compound(s) represented by the formulae (B) to (F) to the (total) content of the agricultural chemical(s) is from 0.05 to 50, preferably from 0.05 to 20 and still more preferably from 0.1 to 10. When this ratio is below 0.05, any desired effect of enhancing the effectiveness of the agricultural chemical(s) can be fully achieved. When this ratio exceeds 50, on the other hand, the enhancing effect is no longer improved. Next, examples of the agricultural chemicals to be used in the agricultural chemical composition of the present invention will be cited, though the agricultural chemicals to be used in the present invention is not restricted thereto. In the case of fungicides (or bactericides), included are Zineb [zinc ethylenebis(dithiocarbamate)], Maneb [manganese ethylenebis(dithiocarbamate)], Thiram [bis(dimethylthiocarbamoyl) disulfide], Mancozeb [complex of zinc and manganese ethylenebis(dithiocarbamate)], Polycarbamate [dizinc bis(dimethyldithiocarbamate) ethylenebis(dithiocarbamate)], Propineb [polymeric zinc propylenebis(dithiocarbamate)], benzimidazole fungicides such as Benomyl [methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate] and Thiophanate-methyl [1,2-bis(3-methoxycarbonyl-2-thioureido)benzene]; Vinclozolin [3-(3,5-dichlorophenyl)-5-methyl-5-vinyl-1,3-oxazolidine-2,4-dione], Iprodione [3-(3,5-dichlorophenyl)-N-isopropyl-2,4-dioxoimidazolidine-1-carboxamide], Procymidone [N-(3,5-dichlorophenyl)-1,2-dimethylcyclopropane-1,2-dicarboximide], Anilazine (Triazine) [2,4-dichloro-6-(2-chloroanilino)-1,3,5-triazine], Triflumizole [(E)-4-chloro-α,α,α-trifluoro-N-(1-imidazol-1-yl-2-propoxyethylidene)toluidine], Metalaxyl [methyl N-(2-methoxyacetyl)-N-(2,6-xylyl)-DL-alaninate], Bitertanol [all-rac-1-(biphenyl-4-yl-oxy)-3,3-dimethyl-1-(1H-1,2,4-triazol-1-yl)-2-butan-2-ol], Pyrifenox [2',4'-dichloro-2-(3-pyridyl)acetophenone (EZ)-O-methyloxime], Fenarimol [2,4'-dichloro-α-(pyridin-5-yl)benzhydryl alcohol], Triforine [1,4-bis-(2,2,2-trichloro-1-formamidoethyl)piperazine], Iminoctadine acetate [1,1'-iminiodi(octamethylene)-diguanidinium triacetate], organocopper compound (Oxine-copper [copper 8-quinolinolate]), antibiotic bactericides (streptomycin type, tetracycline type, polyoxins type, blasticidin S, kasugamycin type, validamycin type), Triadimefon [1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4- triazol-1-yl)-2-butanone], Isoprothiolane [diisopropyl 1,3-dithiolan-2-ylidenemalonate], Chlorothalonil (Daconil) [tetrachloroisophthalonitrile], Etridiazol (Pansoil) [5-ethoxy-3-trichloromethyl-1,2,4-thiadiazole], Fthalide [4,5,6,7-tetrachlorophthalide], Iprobenfos (Kitazin P) [O,O-diisopropyl-S-benzyl thiophosphate], Edifenphos (Hinosan) [O-ethyl S,S-diphenyl dithiophosphate], Probenazole [3-allyloxy-1,2-benzisothiazole-1,1-dioxide], Captan [N-trichloromethylthiotetrahydrophthalimide] and Fosetyl [aluminum tris(ethylphosphonate)]. In the case of insecticides, included are pyrethroid insecticides such as Fenvalerate [α-cyano-3-phenoxybenzyl 2-(4-chlorophenyl)-3-methylbutanoate] and Cyfluthrin (Baythroid) [α-cyano-4-fluoro-3-phenoxyphenylmethyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclcopropanecarboxylate]; organophosphorus insecticides such as Dichlorvos (DDVP) [dimethyl 2,2-dichlorovinyl phosphate], Fenitrothion (MEP) [O,O-dimethyl-O-(3-methyl-4-nitrophenyl)thiophosphate], Malathion (Malathon) [S-[1,2-bis(ethoxycarbonyl)ethyl]dimethyl phosphorothiol-thionate], Dimethoate [dimethyl S-(N-methylcarbamoylmethyl)dithiophosphate], Phenthoate (Elsan) [S-[α-(ethoxycarbonyl)benzyl]dimethyl phosphorothiol-thionate] and Fenthion (Baycid) [O,O-dimethyl-O-[3-methyl-4-(methylthio)phenyl]thiophosphate]; carbamate insecticides such as Fenobucarb (Bassa) [O-sec-butylphenyl methylcarbamate], Metolcarb (MTMC) [m-tolyl methylcarbamate], Xylylcarb (Meobal) [3,4-dimethylphenyl N-methylcarbamate] and Carbaryl (NAC) [1-naphthyl N-methylcarbamate]; Methomyl [S-methyl N-(methylcarbamoyloxy)thioacetimidate] and Cartap [1,3-bis(carbamoylthio)-2-(N,N-dimethylamino)propane hydrochloride]. In the case of miticides (or acaricides), included are Pyridaben [2-tert-butyl-5-(4-tert-butylbenzylthio)-4-chloropyridazin-3(2H)-one], Acricid [2,4-dinitro-6-sec-butylphenyldimethylacrylate], Chloromite [isopropyl 4,4-dichlorobenzylate], Chlorobenzilate (Akar) [ethyl 4,4'-dichlorobenzilate], Dicofol (Kelthane) [1,1-bis(p-chlorophenyl)-2,2,2-trichloroethanol], Benzoximate (Citrazon) [ethyl-O-benzoyl-3-chloro-2,6-dimethoxybenzohydroximate], Propargite (Omite) [2-(p-tert-butylphenoxy)cyclohexyl 2-propynyl sulfite], Fenbutatin Oxide (Osadan) [hexakis(β,β-dimethylphenylethyl)distannoxane], Hexythiazox [trans-5-(4-chlorophenyl)-N-cyclohexyl-4-methyl-2-oxothiazolidine-3-carboxamide] and Amitraz [3-methyl-1,5-bis(2,4-xylyl)-1,3,5-triazapenta-1,4-diene]. In the case of herbicides, included are acid amide hebicides such as Propanil (DCPA) [3',4'-dichloropropionanilide] and Alachlor [2-chloro-2',6'-diethyl-N-(methoxyethyl)acetanilide]; urea herbicides such as Diuron (DCMU) [3-(3,4-dichlorophenyl)-1,1-dimethylurea] and Linuron [3-(3,4-dichlorophenyl)-1-methoxy-1-methylurea); dipyridyl herbicides such as Paraquat Dichloride (Paraquat) [1,1'-dimethyl-4,4'-bipyridirium dichloride] and Diquat Dibromide (Diquat) [6,7-dihydrodipyrido[1,2-a:2',1'-c]-pyrazindiium dibromide]; diazine herbicides such as Bromacil [5-bromo-3-sec-butyl-6-methyluracil]; S-triazine herbicides such as Simazine [2-chloro-4,6-bis(ethylamino)-1,3,5-triazine] and Simetryn [2,4-bis(ethylamino)-6-methylthio-1,3,5-triazine]; nitrile herbicides such as Dichlobeni (DBN) [2,6-dichlorobenzonitrile]; dinitroaniline herbicides such as Trifluralin [α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine]; carbamate herbicides such as Benthiocarb [S-p-chlorobenzyl diethylthiocarbamate] and MCC [methyl 3,4-dichlorocarbanilate]; diphenylether herbicides such as Nitrofen (NIP) [2,4-dichlorophenyl-p-nitrophenylether]; phenol herbicides such as PCP [pentachlorophenol]; benzoic acid herbicides such as Dicamba (MDBA) [3,6-dichloro-2-methoxybenzoic acid dimethylamine salt]; phenoxy herbicides such as 2,4-D [2,4-dichlorophenoxyacetic acid and salts (sodium, amine and ethylether) thereof], and Mapica (MCPCA) [2'-chloro-2-(4-chloro-o-tolyloxy)acetanilide]; organic phosphorus herbicides such as Glyphosate [N-(phosphonomethyl)glycine] and salts thereof, Bialaphos [sodium salt of L-2-amino-4-[(hydroxy)(methyl)phosphinoyl]butyryl-L-alanyl-L-alanine) and Glufosinate [ammonium DL-homoalanin-4-yl (methyl)phosphinate], and aliphatic herbicides such as TCA [trichloroacetic acid and salts thereof]. In the case of plant growth regulators, included are MH (maleic hydrazide), Ethephon [2-chloroethylphosphonic acid], UASTA and Bialaphos. The agricultural chemical composition of the present invention may be formulated into any preparation such as emulsions, wettable powders, granules, powders and flowables without any limitation. Accordingly, the composition of the present invention may contain other additives which are selected depending on the formulation, for example, emulsifiers, dispersing agents and carriers. The agricultural chemical composition according to the present invention may further contain a chelating agent, a pH regulator, an inorganic salt or a thickener, if required. Examples of chelating agents include aminopolycarboxylic acid type chelating agents, aromatic or aliphatic carboxylic acid type chelating agents, amino acid type chelating agents, ether polycarboxylic acid type chelating agents, phosphonic acid type chelating agents such as iminodimethylphosphonic acid (IDP) and alkyldiphosphonic acids (ADPA), and dimethylglyoxime (DG). These chelating agents are as such or in the form of salts (sodium, potassium or ammonium salt) thereof. Examples of the aminopolycarboxylic acid type chelating agents include a) compounds represented by the chemical formula of RNX 2 , b) compounds represented by the chemical formula of NX 3 , c) compounds represented by the chemical formula of R-NX-CH 2 CH 2 -NX-R, d) compounds represented by the chemical formula of R-NX-CH 2 CH 2 -NX 2 , e) compounds represented by the chemical formula of X 2 N-R'-NX 2 and f) compounds similar to compounds of e) and containing four or more Xs, for example, a compound represented by the formula: In the above formulae, X represents -CH 2 COOH or -CH 2 CH 2 COOH, R represents a group to be contained in these type, known chelating agents such as a hydrogen atom, an alkyl group, a hydroxyl group and a hydroxyalkyl group, and R' represents a group to be contained in these type, known chelating agents such as an alkylene group and a cycloalkylene group. Representative examples of the aminopolycarboxylic acid type chelating agents include ethylenediaminetetraacetic acid (EDTA), cyclohexanediaminetetraacetic acid (CDTA), nitrilotriacetic acid (NTA), iminodiacetic acid (IDA), N-(2-hydroxyethyl)iminodiacetic acid (HIMDA), diethylenetriaminepentaacetic acid (DTPA), N-(2-hydroxyethyl)ethylenediaminetriacetic acid (EDTA-OH) and glycoletherdiaminetetraacetic acid (GEDTA), and salts thereof. Examples of the aromatic or aliphatic carboxylic acid type chelating agents to be used in the present invention include citric acid, oxalic acid, glycolic acid, pyruvic acid and anthranilic acid, and salts thereof. Further, examples of the amino acid type chelating agents to be used in the present invention include glycine, serine, alanine, lysine, cystine, cysteine, ethionine, tyrosine and methionine, and salts and derivatives thereof. Furthermore, examples of the ether polycarboxylic acid type chelating agents to be used in the present invention include compounds represented by the following formula, compounds similar to the compounds represented by the following formula and salts (e.g., sodium salt) thereof: wherein Y 1 represents a hydrogen atom, -CH 2 COOH or -COOH, and Z 1 represents a hydrogen atom, -CH 2 COOH or Examples of the pH regulators to be used in the present invention include citric acid, phosphoric acid (e.g., pyrophosphoric acid) and gluconic acid, and salts thereof. Examples of the inorganic acid salts to be used in the present invention include inorganic mineral salts such as clay, talc, bentonite, zeolite, calcium carbonate, diatomaceous earth and white carbon, and inorganic ammonium salts such as ammonium sulfate, ammonium nitrate, ammonium phosphate, ammonium thiocyanate, ammonium chloride and ammonium sulfamate. In addition, examples of thickeners to be used in the present invention include natural, semisynthetic and synthetic, water-soluble thickeners. As natural mucilaginous matters, xanthane gum and zanflow, which are derived from microorganism, and pectine, gum arabic and guar gam, which are derived from plant, are cited. As semisynthetic mucilaginous matters, methylated, carboxyalkylated and hydroxyalkylated products of cellulose such as methylcellulose, carboxymethylcellulose and hydroxymethylcellulose, methylated, carboxyalkylated and hydroxyalkylated products of starch derivatives, and sorbitol are cited. Furthermore, polyacrylates, polymaleates, polyvinylpyrrolidone and pentaerythritol/ethyleneoxide adducts are cited as synthetic mucilaginous matters. The agricultural chemical composition of the present invention may further contain one or more ingredients such as plant growth regulators other than those cited above, fertilizers and preservatives. The agricultural chemical composition of the present invention is used in order to control fungi (or bacteria), insects, mites (or acarids) and herbs or to regulate the growth of plants. The agricultural chemical kit according to the present invention comprises a container containing the enhancer according to the present invention and another container containing an agricultural chemical. In this case, the enhancer may comprise at least one compound represented by the above formulae (B) to (F), or a mixture of at least one compound represented by the above formulae (B) to (F) and at least one surfactant other than the compounds represented by the above general formulae (B) to (F). Alternatively, another agricultural chemical kit according to the present invention comprises a container containing at least one compound represented by the above formulae (B) to (F), a container containing at least one surfactant other than the compounds represented by the above formulae (B) to (F) and a container containing an agricultural chemical. In the agricultural chemical kit according to the present invention, a composition comprising an agricultural chemical is separated from the compounds represented by the above formulae (B) to (F). Namely, the kit differs from an agricultural chemical composition comprising the enhancer for agricultural chemicals and an agricultural chemical(s) in admixture. Each of contents in these containers is not restricted in their form but appropriately prepared depending on the use and purpose. The material of the container is not restricted so long as it is not react with or affect the content. Examples of the material include plastics, glass, foil, etc. The enhancer according to the present invention is applied with an agricultural chemical to a locus which would benefit from such treatment, i.e., the application of the enhancer and the agricultural chemical. In general, the enhancer and the agricultural chemical are used with water or a liquid carrier. As means for applying the enhancer for agricultural chemicals according to the present invention, (1) one wherein an agricultural chemical composition of the present invention containing the enhancer and having a preparation form is used (if necessary, the agricultural chemical composition is diluted with, for example, tap water), (2) another one wherein an enhancer is added to an agricultural chemical composition, which has been diluted with water, and (3) another one wherein an enhancer is diluted with water and then an agricultural chemical composition is diluted with the resultant diluted enhancer solution, are useful. The desired enhancement effect can be achieved by either means. The agricultural chemical composition of the present invention includes one containing the agricultural chemical in high concentration and the enhancer in high concentration, and another one containing the agricultural chemical in an appropriate concentration for application and the enhancer in an appropriate concentration for application. When the former is used, the agricultural chemical composition is diluted with water, etc., for example, just before applying. On the other hand, the agricultural chemical compositions used in the above cases (2) and (3) include those containing the agricultural chemical in high concentration and being free from the enhancer of the present invention. The contents of the agricultural chemical and the enhancer in their diluted solution are not limited. The content of the agricultural chemical in its diluted solution depends on, for example, the kind of the agricultural chemical and its use. While the content of the enhancer in its diluted solution depends on, for example, the kind of the agricultural chemical to be mixed. The diluted liquid comprising an appropriate amount of an agricultural chemical and an appropriate amount of an enhancer of the present invention is applied to, for example, plants, crops, vegetables, fruits, trees, fruit trees, grasses, weeds or seeds, and, at the same time, to fungi, bacteria, insects, acarids or mites. In other words, the diluted liquid is applied to a farm, a plantaion, a fruit garden, an orchard, a flower garden, a lawn, a wood and a forest. Examples The present invention will now be described in more detail with reference to the following Examples which should not be considered to limit the scope of the present invention. Reference Example 1 By using compounds listed in Table 1, various enhancers for agricultural chemicals listed in Tables 2 and 3 were prepared. The above-mentioned enhancers were each dissolved in deionized water to give a 0.2% by weight [as a content of an active ingredient(s)] dilution. With the use of the 0.2% by weight dilution thus obtained, commercially available herbicides, i.e., a Roundup liquid formulation (containing 41% by weight of isopropylamine salt of Glyphosate as an active ingredient), a Karmex wettable powder (containing 78.5% by weight of DCMU as an active ingredient) and Herbiace water-soluble powder (containing 20% by weight of Bialaphos as an active ingredient) were each diluted 300-fold. Thus three agricultural chemical compositions were obtained for each enhancer for agricultural chemicals. Fertile soil obtained from a paddy field, gravels (i.e., river sand) and a culture soil available on the market were mixed one another at the weight ratio of 7:2:1. Pots having an inside diameter of 12 cm were filled with the soil thus obtained. In order to conduct a glasshouse-test, the seeds of crabgrass were sowed in the pots and germinated. The pots wherein the growth of the crabglass was abnormal were abandoned to reduce the irregularity among pots. The pots wherein crabgrasses had been grown at a height of about 18 cm were used in the test. Spray gun (mf. by Iwata Tosoki Kogyo K.K., type RG) was used for the application of the agricultural chemical compositions to the crabgrasses. The crabgrasses in the pots were uniformly sprayed with each of the agricultural chemical compositions at a ratio corresponding to 1000 l/ha (liter per hectare) to evaluate the herbicidal efficacy. On the tenth day after the application, the above-ground part of the fresh plant was weighed and the result was expressed in a herbicidal percentage on the basis of the fresh weight of the above-ground part in the untreated lot (see the following formula). Herbicidal percentage (%) = above-ground fresh weight (g) of an untreated lot - above-ground fresh weight (g) of a test lot above-ground fresh weight (g) of an untreated lot × 100 percentage = (%) Tables 4 and 5 show the herbicidal percentages of the agricultural chemical compositions. Enhancer No. Compd. No. (A) Surfactant (B) used together (A)/(B) by wt. 1 (1) - 100/0 2 (1) POE(10) nonylphenyl ether 80/20 3 (1) POE(7) sec. C 12-13 ether 80/20 4 (1) POE(20) sorbitan monooleate 80/20 5 (2) - 100/0 6 (2) POE(9) nonylphenyl ether 75/25 7 (2) POE(7) linear & branched C 12-13 ether 75/25 8 (2) POE(20) sorbitan monolaurate 75/25 9 (3) - 100/0 10 (3) POE(10) nonylphenyl ether 80/20 11 (3) POE(7) sec. C 12-13 ether 80/20 12 (3) POE(20) sorbitan monooleate 70/30 13 (4) - 100/0 14 (4) sodium POE(20) lauryl ether sulfate 75/25 15 (4) POE(7) sec. C 12-13 ether 75/25 16 (4) POE(20) sorbitan monolaurate 75/25 Note: In the above table, POE stands for polyoxyethylene and numbers given in parentheses mean the average addition mole numbers of ethylene oxide (the same will apply hereinafter). Enhancer No. Compd. No. (A) Surfactant (B) used together (A)/(B) by wt. 17 (5) - 100/0 18 (5) POE(10) nonylphenyl ether 70/30 19 (5) POE(7) linear & brached C 12-13 ether 70/30 20 (5) POE(20) sorbitan monooleate 70/30 21 (6) - 100/0 22 (6) POE(9) nonylphenyl ether 80/20 23 (6) POE(7) sec. C 12-13 ether 80/20 24 (6) POE(20) sorbitan monolaurate 80/20 25 (7) - 100/0 26 (7) POE(10) nonylphenyl ether 80/20 27 (7) POE(7) linear & branched C 12-13 ether 80/20 28 (7) POE(20) sorbitan monooleate 80/20 29 dimethyldipalmitylammonium chloride - 30 trimethylmonolaurylammonium chloride - 31 monomethyldistearylhydroxyethylammonium chloride - 32 trimethylcocoylammonium chloride - Enhancer No. Herbicidal percentage (%) Karmex wettable powder Herbiace water-soluble powder Roundup liquid formulation 1 96.3 99.0 98.4 2 97.2 98.2 99.1 3 99.1 99.2 96.8 4 93.1 97.4 98.2 5 95.7 97.6 99.4 6 96.8 98.3 96.5 7 92.3 98.7 98.7 8 94.9 97.0 99.0 9 83.4 92.9 96.2 10 90.6 94.3 97.7 11 92.8 97.8 98.4 12 97.7 95.4 94.1 13 97.8 98.8 99.3 14 99.3 99.2 99.5 15 96.9 99.1 98.8 16 98.4 98.7 98.2 Enhancer No. Herbicidal percentage (%) Karmex wettable powder Herbiace water-soluble powder Roundup liquid formulation 17 98.2 96.3 99.6 18 95.6 93.7 99.2 19 89.3 97.2 98.6 20 92.1 98.5 98.8 21 97.6 95.9 91.3 22 98.7 97.3 95.6 23 99.3 99.1 96.4 24 98.4 98.6 99.1 25 95.4 99.4 98.9 26 97.6 98.7 99.4 27 97.7 99.2 99.0 28 98.4 99.2 98.1 29 60.1 73.8 75.8 30 48.2 71.8 70.1 31 63.8 76.2 73.2 32 55.3 72.9 71.5 no addition 41.2 64.7 65.3 Reference Example 2 Female imagines of Tetranychus kanzawai kishida were planted onto kidney bean leaf discs at a ratio of 30 imagines per lot on 3 runs and then incubated at 25°C for 24 hours. Subsequently, the whole leaf discs were dipped in a test solution for 5 seconds. After taking out of the test solution and allowing to stand at 25°C for 48 hours, the leaf discs were observed and the miticidal ratio was determined on the basis of the result in the untreated lot (see the following formula). Miticidal ratio (%) = the number of living mites of an untreated lot - the number of living mites of a test lot the number of living mites of ban untreated lot × 100 As miticides, a Nissorun V emulsion (containing 55% by weight of active ingredients including 50% by weight of hexythiazox and 5% by weight of DDVP) and an Osadan wettable powder-25 (containing 25% by weight of phenbutatin oxide as active ingredient) were each diluted 2,000-fold and used. The same enhancers for agricultural chemicals, as those employed in Reference Example 1 were used. The concentration of the active ingredient(s) of each enhancers for agricultural chemicals in the dilution was adjusted to 0.1% by weight. Further, the above procedure was repeated without using any enhancers. Table 6 shows the results. Enhancer No. Miticidal ratio (%) Nissolan V emulsion Osadan wettable powder-25 1 98.9 100 2 100 97.8 3 100 100 4 97.8 96.7 5 100 92.2 6 96.7 96.7 7 97.8 100 8 97.8 95.6 9 90.0 93.3 10 92.2 95.6 11 93.3 90.0 12 96.7 97.8 13 100 100 14 98.9 100 15 100 98.9 16 100 96.7 17 92.2 96.7 18 97.8 98.9 19 97.8 93.3 20 98.9 95.6 21 93.3 92.2 22 90.0 95.6 23 96.7 97.8 24 90.0 93.3 25 98.9 100 26 100 96.7 27 98.9 93.3 28 97.8 97.8 29 50.0 46.7 30 48.9 51.1 31 50.0 44.4 32 48.9 53.3 no addition 43.3 42.2 Reference Example 3 Rice planthopper larvae of the third instar were incubated and used in an efficacy test on insecticides in triplicate runs by the dipping method (each lot having 10 larvae). The insecticidal ratio was determined in the same manner as the one employed for the determination of the miticidal ratio. Commercially available insecticides, i.e., a Sumithion emulsion (containing 50% by weight of MEP as active ingredient) and a Malathon emulsion (containing 50% by weight of malathon as active ingredient) were each diluted 2,000-fold and used. As enhancers for agricultural chemicals, those employed in Reference Example 1 were used in such a manner as to adjust the concentration of the active ingredient(s) of each enhancer in the diluted solution to 0.1% by weight. Table 7 shows the results. Enhancer No. Insecticidal ratio (%) Sumithion emulsion Malathon emulsion 1 100 93.3 2 96.7 90.0 3 90.0 96.7 4 100 96.7 5 93.3 100 6 100 93.3 7 96.7 90.0 8 90.0 93.3 9 86.7 96.7 10 90.0 93.3 11 96.7 93.3 12 93.3 90.0 13 93.3 100 14 100 96.7 15 100 93.3 16 96.7 100 17 90.0 90.0 18 93.3 96.7 19 86.7 86.7 20 93.3 90.0 21 96.7 93.3 22 93.3 93.3 23 90.0 100 24 96.7 90.0 25 100 96.7 26 96.7 100 27 86.7 96.7 28 90.0 93.3 29 63.3 56.7 30 53.3 60.0 31 53.3 63.3 32 50.0 60.0 no addition 43.3 50.0 Reference Example 4 10 ml/pot of a spore suspension (10 7 spores/ml) of Botrytis cinerea acquiring the resistance against fungicides was applied onto young cucumber seedlings with 3 true leaves, which were then allowed to stand at 25°C under a relative humidity of 90% for 1 day. Then, a commercially available fungicide, i.e., a Benlate wettable powder (containing 50% by weight of benomyl as active ingredient), was diluted 2000-fold with the 2500-dilution of each enhancer employed in Reference Example 1. The dilution thus obtained was applied onto the seedlings at a ratio of 5 ml/pot. After allowing to stand at 25°C under a relative humidity of 85%, lesions were counted and the preventive value was calculated in accordance with the following formula. Table 8 shows the results. Preventive value = 1 - no. of lesions of a test lot no. of lesions of an untreated lot × 100 Enhancer No. Preventive value Benlate wettable powder 1 98 2 100 3 95 4 98 5 93 6 98 7 100 8 98 9 95 10 93 11 95 12 100 13 100 14 100 15 95 16 98 17 95 18 93 19 95 20 95 21 98 22 93 23 95 24 93 25 100 26 93 27 90 28 98 29 63 30 70 31 75 32 70 no addition 60 Reference Example 5 The same test as the one effected in Reference Example 1 was carried out by using a Roundup liquid formulation (containing 41% by weight of active ingredient) as a herbicide, and the enhancers 7, 14 and 17 of Reference Example 1 as enhancers each in the amount as specified in Table 9. The results are given in Table 9. In Table 9, the term "agricultural chemical concentration" stands for the concentration of the active ingredient(s) of the commercially available agricultural chemical formulation in the dilution for application, and the term "enhancer concenrtation" stands for the concentration of the active ingredient(s) of the enhancer in the dilution for application (the same will apply hereinafter). Test No. Enhancer No. Herbicide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./enhancer concn. by wt. Herbicidal percentage (%) 1 7 2000 50 1/0.06 87.6 2 2000 100 1/0.12 95.3 3 2000 500 1/0.6 98.6 4 2000 1000 1/1.2 99.2 5 2000 5000 1/6 97.7 6 2000 10000 1/12 98.8 7 2000 30000 1/37 99.0 8 14 2000 50 1/0.06 88.3 9 2000 100 1/0.12 93.8 10 2000 500 1/0.6 98.9 11 2000 1000 1/1.2 96.7 12 2000 5000 1/6 99.1 13 2000 10000 1/12 98.2 14 2000 30000 1/37 98.5 15 17 2000 50 1/0.06 90.6 16 2000 100 1/0.12 97.3 17 2000 500 1/0.6 95.4 18 2000 1000 1/1.2 98.6 19 2000 5000 1/6 97.7 20 2000 10000 1/12 98.9 21 2000 30000 1/37 97.9 22 - 2000 0 - 57.3 Reference Example 6 The same test as the one effected in Reference Example 3 was carried out by using a Sumithion emulsion as an insecticide, and the enhancers 5 and 16 of Reference Example 1 as enhancers each in the amount as specified in Table 10. The results are given in Table 10. Test No. Enhancer No. Insecticide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./ enhancer concn. by wt. Insecticidal ratio (%) 1 250 10 1/0.08 83.3 2 250 25 1/0.2 90.0 3 250 250 1/2 96.7 5 4 250 1000 1/8 100 5 250 2500 1/20 100 6 250 5000 1/40 100 7 250 10 1/0.08 86.7 8 250 25 1/0.2 93.3 9 250 250 1/2 93.3 16 10 250 1000 1/8 100 11 250 2500 1/20 100 12 250 5000 1/40 100 13 - 250 0 - 57.3 〈Production Example〉 150 g of a 50% aqueous solution of dimethylamine was introduced into a four-necked flask provided with a stirrer, a thermometer and a dropping funnel. 115 g of glycerol-α-monochlorohydrin and 95 g of a 48% aqueous solution of sodium hydroxide were dropwise added thereinto under cooling and the resulting mixture was stirred under cooling for 10 hours. The obtained aqueous solution was distilled at 80°C under reduced pressure to remove water. The residue was distilled to thereby give 100 g of dimethylaminopropanediol (A) as distillate. 40 g of the compound (A) obtained above and 275 g of polyoxyethylene ether carboxylic acid were introduced into a four-necked flask provided with a stirrer, a thermometer and a dehydrating tube and the mixture was heated to 180°C. Esterification was effected at the same temperature for 10 hours while removing the water thus formed by distillation. Thus 300 g of the compound (11) was obtained. Example 1 By using compounds listed in Table 11, various enhancers for agricultural chemicals listed in Table 12 were prepared. The above-mentioned enhancers were each dissolved in deionized water to give a 0.2% by weight [as a content of an active ingredient(s)] dilution. With the use of the 0.2% by weight dilution thus obtained, commercially available herbicides, i.e., a Roundup liquid formulation (containing 41% by weight of isopropylamine salt of Glyphosate as an active ingredient), a Karmex wettable powder (containing 78.5% by weight of DCMU as an active ingredient) and Herbiace water-soluble powder (containing 20% by weight of Bialaphos as an active ingredient) were each diluted 300-fold. Thus three agricultural chemical compositions were obtained for each enhancer for agricultural chemicals. The same test as the one effected in Reference Example 1 was carried out by using the agricultural chemical compositions thus prepared, and the herbicidal percentages were calculated in the same manner as that described in Reference Example 1. Table 13 shows the herbicidal percentages of the agricultural chemical compositions. Enhancer No. Compd. No. (A) Surfactant (B) used together (A)/(B) by wt. 101 (11) - 100/0 102 (11) POE(20) sorbitan monooleate 80/20 103 (11) sodium POE(20) lauryl ether sulfate 80/20 104 (12) - 100/0 105 (12) POE(9) nonylphenyl ether 80/20 106 (12) POE(7) sec. C 12-13 ether 80/20 107 (13) - 100/0 108 (13) POE(10) nonylphenyl ether 80/20 109 (13) POE(8) oleyl ether 80/20 110 (14) - 100/0 111 (14) POE(7) linear & branched C 12-13 ether 80/20 112 (14) POE(10) octylphenyl ether 80/20 113 monomethyldilaurylamine - 114 dimethylmonopalmitylamine - 115 POE(3) octylamine - Note: Enhancer Nos. 113 to 115 are comparatve ones. Enhancer No. Herbicidal percentage (%) Karmex wettable powder Herbiace water-soluble powder Round up liquid formulation Invention product 101 91.2 98.3 99.5 102 89.3 95.1 95.4 103 93.1 95.7 96.2 104 97.8 97.5 99.9 105 95.1 97.7 95.6 106 95.1 95.6 93.2 107 93.7 99.0 99.7 108 91.2 94.2 94.8 109 94.8 97.2 95.0 110 87.6 91.3 89.7 111 89.5 90.8 92.1 112 92.3 91.8 95.1 Comp. product 113 49.4 62.4 68.9 114 53.8 68.1 70.5 115 63.4 72.4 76.1 no addition 42.3 60.5 63.8 Example 2 The same test as the one effected in Reference Example 2 was carried out and the miticidal ratio was determined in the same manner as that described in Reference Example 2, except that the enhancers for agricultural chemicals employed in Example 1 were used. Table 14 shows the results. Enhancer No. Miticidal ratio (%) Nissolan V emulsion Osadan wettable powder-25 Invention product 101 97.3 100 102 96.0 100 103 95.3 98.6 104 100 100 105 98.6 98.6 106 99.3 99.3 107 99.3 97.3 108 100 100 109 100 98.6 110 95.3 95.3 111 96.0 97.3 112 95.3 99.3 Comp. product 113 51.3 46.7 114 60.0 48.0 115 66.7 53.3 no addition 46.7 43.3 Example 3 The same test as the one effected in Reference Example 3 was carried out and the insecticidal ratio was determined in the same manner as that of Reference Example 3, except that the enhancers for agricultural chemicals employed in Example 1 were used. Table 15 shows the results. Enhancer No. Insecticidal ratio (%) Sumithion emulsion Malathon emulsion Invention product 101 96.7 96.7 102 96.7 100 103 96.7 100 104 96.7 96.7 105 100 100 106 96.7 100 107 93.3 96.7 108 96.7 96.7 109 96.7 100 110 90.0 90.0 111 96.7 93.3 112 93.3 96.7 Comp. product 113 46.7 53.3 114 50.0 56.7 115 63.3 66.7 no addition 43.3 46.7 Example 4 The same test as the one effected in Reference Example 4 was carried out and the preventive value was determined in the same manner as that described in Reference Example 4, except that the enhancers for agricultural chemicals employed in Example 1 were used. Table 16 shows the results. Enhancer No. Preventive value Benlate wettable powder Invention product 101 94 102 96 103 96 104 91 105 95 106 93 107 97 108 100 109 99 110 89 111 93 112 92 Comp. product 113 60 114 64 115 71 no addition 58 The above Examples 1 to 4 show tests whereby the efficacies of the enhancers for agricultural chemicals of the present invention were compared with those of common cationic surfactants (comparative products) employed as enhancers for agricultural chemicals. As Tables 13 to 16 clearly indicate, the enhancers for agricultural chemicals of the present invention exerted remarkable effects and thus were usable on a practical level. In contrast, the comparative products somewhat enhanced the efficacies of the agricultural chemicals but were not effective on a practical level. Accordingly, it is observed that the enhancers for agricultural chemicals of the present invention would specifically enhance the efficacies of agricultural chemicals as compared with common cationic surfactants. Example 5 The same test as the one effected in Reference Example 1 was carried out by using a Roundup liquid formulation (containing 41% by weight of active ingredient) as a herbicide, and the enhancers 101 and 109 of Example 1 as enhancers each in the amount as specified in Table 17. The results are given in Table 17. Test No. Enhancer No. Herbicide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./ enhancer concn. by wt. Herbicidal percentage (%) 1 101 2000 50 1/0.06 88.9 2 2000 100 1/0.12 92.4 3 2000 500 1/0.6 97.5 4 2000 1000 1/1.2 99.8 5 2000 5000 1/6 99.7 6 2000 10000 1/12 98.6 7 2000 30000 1/37 98.0 8 109 2000 50 1/0.06 87.6 9 2000 100 1/0.12 89.9 10 2000 500 1/0.6 94.2 11 2000 1000 1/1.2 98.0 12 2000 5000 1/6 98.0 13 2000 10000 1/12 97.5 14 2000 30000 1/37 97.7 22 - 2000 0 - 67.1 Example 6 The same test as the one effected in Reference Example 3 was carried out by using a Sumithion emulsion as an insecticide, and the enhancers 104 and 111 of Example 1 as enhancers each in the amount as specified in Table 18. The results are given in Table 18. Test No. Enhancer No. Insecticide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./ enhancer concn. by wt. Insecticidal ratio (%) 1 104 250 10 1/0.08 86.7 2 250 25 1/0.2 90.0 3 250 250 1/2 93.3 4 250 1000 1/8 96.7 5 250 2500 1/20 96.7 6 250 5000 1/40 96.7 7 111 250 10 1/0.08 86.7 8 250 25 1/0.2 93.3 9 250 250 1/2 96.7 10 250 1000 1/8 96.7 11 250 2500 1/20 96.7 12 250 5000 1/40 93.3 13 - 250 0 - 43.3 Example 7 By using compounds listed in Table 19, various enhancers for agricultural chemicals listed in Table 20 were prepared. By using the above-mentioned enhancers, herbicidal efficacies were evaluated in the same manner as that in Reference Example 1. Table 21 shows the herbicidal percentage of the agricultural compositions used. Enhancer No. Compd. No. (A) Surfactant (B) used together (A)/(B) by wt. 116 (15) - 100/0 117 (15) POE(10) nonylphenyl ether 80/20 118 (15) POE(20) sorbitan monooleate 80/20 119 (16) - 100/0 120 (16) POE(8) oleyl ether 80/20 121 (16) POE(6) sorbitan monooleate 80/20 122 (17) - 100/0 123 (17) sodium POE(20) lauryl ether sulfate 80/20 124 (17) POE(7) linear & branched C 12-13 ether 80/20 125 (18) - 100/0 126 (18) POE(20) sorbitan monolaurate 80/20 127 (18) sodium POE(20) lauryl ether sulfate 80/20 128 dimethyldipalmitylammonium chloride - 129 trimethylmonolaurylammonium bromide - 130 POE(30) monomethylmonostearylammonium chloride - Note: Enhancer Nos. 128 to 130 are comparative ones. Enhancer No. Herbicidal percentage (%) Karmex wettable powder Herbiace water-soluble powder Round up liquid formulation Invention product 116 89.4 94.8 97.1 117 92.3 96.7 99.8 118 91.5 97.2 99.4 119 94.8 96.4 98.1 120 93.2 98.1 99.4 121 95.5 98.9 98.9 122 90.1 97.3 99.0 123 93.4 98.4 99.5 124 92.8 97.8 98.9 125 88.9 93.2 97.6 126 92.1 94.5 96.5 127 91.5 95.1 99.2 Comp. product 128 59.7 63.4 69.3 129 60.5 68.2 74.1 130 65.2 70.4 78.2 no addition 42.3 60.5 63.8 Example 8 By using the same ehnancers as those used in Example 7, miticidal efficacies were evaluated in the same manner as the one described in Reference Example 2. Table 22 shows the results. Enhancer No. Miticidal ratio (%) Nissolan V emulsion Osadan wettable powder-25 Invention product 116 96.0 98.0 117 99.3 99.3 118 100 99.3 119 98.6 97.3 120 100 100 121 100 100 122 97.3 96.7 123 98.6 98.0 124 97.3 99.3 125 93.3 93.3 126 95.3 96.0 127 96.7 97.3 Comp. product 128 53.3 46.7 129 66.7 53.3 130 69.3 56.7 no addition 46.7 43.3 Example 9 By using the same enhancers as those used in Example 7, insecticidal efficacies were evaluated in the same manner as the one described in Reference Example 3. Table 23 shows the results. Enhancer No. Insecticidal ratio (%) Sumithion emulsion Malathon emulsion Invention product 116 96.7 96.7 117 100 96.7 118 100 100 119 96.7 100 120 96.7 96.7 121 93.3 93.3 122 100 93.3 123 96.7 96.7 124 96.7 96.7 125 93.3 93.3 126 90.0 100 127 90.0 96.7 Comp. product 128 56.7 63.3 129 66.7 66.7 130 70.0 70.0 no addition 46.7 50.0 Example 10 By using the same enhancers as those used in Example 7, fungicidal efficacies were evaluated in the same manner as the one described in Reference Example 4. Table 24 shows the results. Enhancer No. Preventive value Benlate wettable powder Invention product 116 95 117 99 118 98 119 96 120 100 121 100 122 98 123 99 124 100 125 93 126 95 127 98 Comp. product 128 62 129 67 130 74 no addition 58 Example 11 The same test as the one of Example 7 was effected using a Roundup liquid formulation (containing 41% by weight of active ingredient) as a herbicide, and the enhancers 116 and 121 of Example 7 as enhancers each in the amount as specified in Table 25. The results are given in Table 25. Test No. Enhancer No. Herbicide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./enhancer concn. by wt. Herbicidal percentrage (%) 1 116 2000 50 1/0.06 88.9 2 2000 100 1/0.12 90.9 3 2000 500 1/0.6 95.4 4 2000 1000 1/1.2 99.1 5 2000 5000 1/6 99.5 6 2000 10000 1/12 99.4 7 2000 30000 1/37 99.0 8 121 2000 50 1/0.06 93.2 9 2000 100 1/0.12 96.5 10 2000 500 1/0.6 97.6 11 2000 1000 1/1.2 99.1 12 2000 5000 1/6 99.7 13 2000 10000 1/12 99.1 14 2000 30000 1/37 99.0 22 - 2000 0 - 67.1 Example 12 The same test as the one of Reference Example 3 was effected using a Sumithion emulsion as an insecticide, and the enhancers 118 and 122 of Example 7 as enhancers each in the amount as specified in Table 26. The results are given in Table 26. Test No. Enhancer No. Insecticide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./ enhancer concn. by wt. Insecticidal ratio (%) 1 118 250 10 1/0.08 90.0 2 250 25 1/0.2 93.3 3 250 250 1/2 93.3 4 250 1000 1/8 100 5 250 2500 1/20 100 6 250 5000 1/40 96.7 7 122 250 10 1/0.08 90.0 8 250 25 1/0.2 90.0 9 250 250 1/2 96.7 10 250 1000 1/8 100 11 250 2500 1/20 93.3 12 250 5000 1/40 93.3 13 - 250 0 - 46.7 Example 13 By using compounds listed in Tables 31 and 32, enhancers for agricultural chemicals listed in Tables 33 to 35 were prepared. The above-mentioned enhancers were each dissolved in deionized water to give a 0.2% by weight [as a content of an active ingredient(s)] dilution. With the use of the 0.2% by weight dilution thus obtained, commercially available herbicides, i.e., a Roundup liquid formulation (containing 41% by weight of isopropylamine salt of Glyphosate as an active ingredient), a Karmex wettable powder (containing 78.5% by weight of DCMU as an active ingredient) and Herbiace water-soluble powder (containing 20% by weight of Bialaphos as an active ingredient) were each diluted 300-fold. Thus three agricultural chemical compositions were obtained for each enhancer for agricultural chemicals. The same test as the one effected in Reference Example 1 was carried out by using the agricultural chemical compositions thus prepared, and the herbicidal percentages were calculated in the same manner as that described in Reference Example 1. Tables 36 to 38 show the herbicidal percentages of the agricultural chemical compositions. Enhancer No. Compd. No. (A) Surfactant (B) used together (A)/(B) by wt. 301 (31) - 100/0 302 (31) POE(10) nonylphenyl ether 80/20 303 (31) POE(6) sorbitan monooleate 80/20 304 (32) - 100/0 305 (32) POE(7) sec. C 12-13 ether 80/20 306 (32) POE(20) sorbitan monolaurate 80/20 307 (33) - 100/0 308 (33) POE(9) nonylphenyl ether 80/20 309 (33) POE(9) oleyl ether 80/20 310 (34) - 100/0 311 (34) POE(25) hardened castor oil 80/20 312 (34) POE(9) octylphenyl ether 80/20 313 (35) - 100/0 314 (35) POE(20) sorbitan monooleate 80/20 315 (35) POE(7) linear and branched C 12-13 ether 80/20 316 (36) - 100/0 317 (36) POE(10) nonylphenyl ether 80/20 318 (36) POE(6) sorbitan monooleate 80/20 319 (37) - 100/0 320 (37) POE(9) nonylphenyl ether 80/20 321 (37) POE(20) sorbitan monolaurate 80/20 Enhancer No. Compd. No. (A) Surfactant (B) used together (A)/(B) by wt. 322 (38) - 100/0 323 (38) POE(8) oleyl ether 80/20 324 (38) POE(25) hardened castor oil 80/20 325 (39) - 100/0 326 (39) POE(25) hardened castor oil 80/20 327 (39) POE(9) octylphenyl ether 80/20 328 (40) - 100/0 329 (40) POE(10) nonylphenyl ether 80/20 330 (40) POE(7) linear and branched C 12-13 ether 80/20 331 (41) - 100/0 332 (41) POE(9) nonylphenyl ether 80/20 333 (41) POE(20) sorbitan monolaurate 80/20 334 (42) - 100/0 335 (42) POE(10) nonylphenyl ether 80/20 336 (42) POE(7) sec. C 12-13 ether 80/20 337 (43) - 100/0 338 (43) POE(10) nonylphenyl ether 80/20 339 (43) POE(6) sorbitan monooleate 80/20 340 (44) - 100/0 341 (44) POE(6) lauryl ether 80/20 342 (44) POE(20) sorbitan monolaurate 80/20 343 (45) - 100/0 344 (45) POE(10) nonylphenyl ether 80/20 345 (45) POE(6) sorbitan monolaurate 80/20 Enhancer No. Compd. No. (A) Surfactant (B) used together (A)/(B) by wt. 346 (46) - 100/0 347 (46) POE(9) nonylphenyl ether 80/20 348 (46) POE(7) sec. C 12-13 ether 80/20 349 (47) - 100/0 350 (47) POE(10) nonylphenyl ether 80/20 351 (47) POE(6) sorbitan monooleate 80/20 352 (48) - 100/0 353 (48) POE(6) lauryl ether 80/20 354 (48) POE(20) sorbitan monolaurate 80/20 355 (49) - 100/0 356 (49) POE(10) nonylphenyl ether 80/20 357 (49) POE(6) sorbitan monolaurate 80/20 358 (50) - 100/0 359 (50) POE(9) nonylphenyl ether 80/20 360 (50) POE(7) sec. C 12-13 ether 80/20 361 dimethyldipalmitylammonium chloride - 362 trimethylcocoylammonium chloride - 363 POE(2) monomethylmonooctylammonium chloride - 364 POE(30) plamitylamine - Note: Enhancer Nos. 361 to 364 are comparative ones. Enhancer No. Herbicidal percentage (%) Karmex wettable powder Herbiace water-soluble powder Roundup liquid formulation Invention product 301 89.3 97.4 98.1 302 94.5 98.1 98.9 303 93.2 98.0 97.6 304 95.8 96.5 97.4 305 97.6 95.8 96.5 306 96.9 94.0 99.1 307 98.1 97.6 97.3 308 99.0 98.0 96.5 309 99.0 98.0 95.7 310 95.4 94.3 96.4 311 97.2 96.2 98.8 312 96.5 95.1 97.9 313 96.1 98.8 98.1 314 95.2 99.1 99.1 315 96.1 99.1 99.7 316 90.5 93.8 95.4 317 93.2 95.6 97.2 318 92.5 95.0 96.5 319 89.8 97.5 98.1 320 89.0 96.2 99.4 321 91.5 96.9 98.9 Enhancer No. Herbicidal percentage (%) Karmex wettable powder Herbiace water-soluble powder Roundup liquid formulation Invention product 322 95.2 98.2 96.2 323 96.3 99.1 98.1 324 95.0 99.3 98.1 325 92.0 94.7 97.6 326 90.4 96.2 98.3 327 93.5 94.8 98.0 328 94.1 95.9 99.8 329 96.0 97.0 95.0 330 97.2 97.0 97.4 331 95.8 95.4 96.2 332 96.2 95.0 96.2 333 95.8 93.8 98.0 334 92.1 98.0 97.2 335 93.4 99.4 96.5 336 92.0 99.4 97.0 337 88.6 94.1 94.2 338 92.1 96.2 96.7 339 92.1 95.4 96.1 340 89.8 93.8 95.3 341 95.4 98.9 99.8 342 93.7 97.9 99.8 Enhancer No. Herbicidal percentage (%) Karmex wettable powder Herbiace water-soluble powder Roundup liquid formulation Invention product 343 94.6 97.2 99.6 344 90.2 94.1 97.4 345 92.1 90.5 95.8 346 95.6 96.3 98.9 347 92.5 92.1 95.4 348 93.3 91.8 96.2 349 93.4 95.5 96.3 350 92.3 97.3 96.8 351 94.1 93.1 97.2 352 88.5 91.5 95.2 353 90.6 94.7 98.8 354 92.8 95.8 99.2 355 95.6 91.8 98.6 356 94.1 93.4 99.1 357 95.0 93.1 97.3 358 89.9 96.1 95.4 359 93.7 95.4 98.9 360 92.1 90.2 96.7 Comp. product 361 56.5 72.5 73.8 362 54.2 70.8 72.5 363 65.1 74.2 77.6 364 63.4 72.4 76.1 no addition 42.1 63.9 65.7 Example 14 The same test as the one effected in Reference Example 2 was carried out and the miticidal ratio was determined in the same manner as that described in Reference Example 2, except that the enhancers for agricultural chemicals employed in Example 13 were used. Tables 39 to 41 show the results. Enhancer No. Miticidal ratio (%) Nissolan V emulsion Osadan wettable powder-25 Invention product 301 97.8 98.9 302 98.9 100 303 98.9 100 304 96.7 97.8 305 97.8 98.9 306 95.6 98.9 307 100 100 308 100 98.9 309 98.9 98.9 310 93.3 96.7 311 98.9 100 312 98.9 98.9 313 98.9 98.9 314 97.8 100 315 100 100 316 97.8 95.6 317 98.9 97.8 318 98.9 96.7 319 100 98.9 320 97.8 98.9 321 98.9 98.9 Enhancer No. Miticidal ratio (%) Nissolan V emulsion Osadan wettable powder-25 Invention product 322 94.4 92.2 323 96.7 97.8 324 95.6 93.3 325 98.9 98.9 326 100 100 327 100 100 328 93.3 96.7 329 97.8 98.9 330 95.6 97.8 331 97.8 100 332 100 100 333 98.9 98.9 334 94.4 92.2 335 98.9 95.6 336 97.8 93.3 337 96.7 94.4 338 97.8 95.6 339 97.8 94.4 340 98.9 98.9 341 94.4 95.6 342 97.8 95.6 Enhancer No. Miticidal ratio (%) Nissolan V emulsion Osadan wettable powder-25 Invention product 343 98.9 97.8 344 92.2 93.3 345 91.1 95.6 346 97.8 100 347 95.6 98.9 348 95.6 98.9 349 92.2 96.7 350 97.8 95.6 351 96.7 92.2 352 97.8 95.6 353 97.8 92.2 354 95.6 94.4 355 94.4 95.6 356 97.8 94.4 357 97.8 93.3 358 92.2 93.3 359 95.6 95.6 360 93.3 97.8 Comp. product 361 55.6 47.7 362 52.2 50.0 363 65.6 63.3 364 66.7 62.2 no addition 47.7 42.2 Example 15 The same test as the one effected in Reference Example 3 was carried out and the insecticidal ratio was determined in the same manner as that of Reference Example 3, except that the enhancers for agricultural chemicals employed in Example 13 were used. Tables 42 to 44 show the results. Enhancer No. Insecticidal ratio (%) Sumithion emulsion Malathon emulsion Invention product 301 96.7 96.7 302 96.7 96.7 303 100 100 304 96.7 93.3 305 93.3 96.7 306 100 100 307 93.3 96.7 308 96.7 96.7 309 94.4 93.3 310 96.7 96.7 311 100 100 312 100 100 313 93.3 96.7 314 96.7 93.3 315 93.3 96.7 316 93.3 96.7 317 96.7 96.7 318 96.7 96.7 319 90.0 86.7 320 96.7 93.3 321 96.7 93.3 Enhancer No. Insecticidal ratio (%) Sumithion emulsion Malathon emulsion Invention product 322 96.7 96.7 323 100 100 324 100 100 325 96.7 93.3 326 100 96.7 327 100 100 328 93.3 93.3 329 96.7 96.7 330 96.7 93.3 331 96.7 96.7 332 100 96.7 333 96.7 93.3 334 93.3 93.3 335 90.0 93.3 336 96.7 96.7 337 90.0 86.7 338 93.3 90.0 339 93.3 93.3 340 93.3 96.7 341 100 100 342 100 100 Enhancer No. Insecticidal ratio (%) Sumithion emulsion Malathon emulsion Invention product 343 100 100 344 96.7 93.3 345 90.0 93.3 346 100 100 347 90.0 96.7 348 93.3 93.3 349 96.7 100 350 96.7 96.7 351 90.0 93.3 352 90.0 93.3 353 93.3 96.7 354 90.0 90.0 355 100 86.7 356 96.7 93.3 357 96.7 96.7 358 96.7 100 359 100 90.0 360 93.3 93.3 Comp. product 361 46.7 53.3 362 46.7 56.7 363 60.0 56.7 364 63.3 66.7 no addition 43.3 50.0 Example 16 The same test as the one effected in Reference Example 4 was carried out and the preventive value was determined in the same manner as that described in Reference Example 4, except that the enhancers for agricultural chemicals employed in Example 13 were used. Tables 45 to 47 show the results. Enhancer No. Preventive value Benlate wettable powder Invention present 301 94 302 98 303 98 304 97 305 100 306 100 307 93 308 95 309 93 310 92 311 99 312 99 313 98 314 100 315 99 316 96 317 98 318 98 319 89 320 93 321 92 Enhancer No. Preventive value Benlate wettable powder Invention present 322 92 323 95 324 94 325 99 326 100 327 98 328 92 329 92 330 96 331 94 332 98 333 98 334 93 335 98 336 99 337 88 338 90 339 94 340 92 341 96 342 94 Enhancer No. Preventive value Benlate wettable powder Invention present 343 100 344 96 345 90 346 94 347 89 348 90 349 98 350 96 351 88 352 90 353 94 354 96 355 96 356 90 357 92 358 96 359 100 360 92 Comp. product 361 65 362 67 363 72 364 76 no addition 61 The above Examples 13 to 16 show tests whereby the efficacies of the enhancers for agricultural chemicals of the present invention were compared with those of common cationic surfactants (comparative products) employed as enhancers for agricultural chemicals. As Tables 36 to 47 clearly indicate, the enhancers for agricultural chemicals of the present invention exerted remarkable effects and thus were usable on a practical level. In contrast, the comparative products somewhat enhanced the efficacies of the agricultural chemicals but were not effective on a practical level. Accordingly, it is observed that the enhancers for agricultural chemicals of the present invention would specifically enhance the efficacies of agricultural chemicals as compared with common cationic surfactants. Example 17 The same test as the one effected in Reference Example 1 was carried out by using a Roundup liquid formulation (containing 41% by weight of active ingredient) as a herbicide, and the enhancers 301, 306, 315, 319, 323 and 343 of Example 13 as enhancers each in the amount as specified in Tables 48 and 49. The results are given in Tables 48 and 49. Test No. Enhancer No. Herbicide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./enhancer concn. by wt. Herbicidal percentage (%) 1 301 2000 50 1/0.06 87.9 2 2000 100 1/0.12 91.3 3 2000 500 1/0.6 95.0 4 2000 1000 1/1.2 99.1 5 2000 5000 1/6 99.7 6 2000 10000 1/12 98.8 7 2000 30000 1/37 98.1 8 306 2000 50 1/0.06 88.1 9 2000 100 1/0.12 90.3 10 2000 500 1/0.6 94.8 11 2000 1000 1/1.2 97.3 12 2000 5000 1/6 99.2 13 2000 10000 1/12 97.4 14 2000 30000 1/37 96.5 15 315 2000 50 1/0.06 87.6 16 2000 100 1/0.12 92.5 17 2000 500 1/0.6 95.2 18 2000 1000 1/1.2 98.0 19 2000 5000 1/6 98.9 20 2000 10000 1/12 98.0 21 2000 30000 1/37 97.2 Test No. Enhancer No. Herbicide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./enhancer concn. by wt. Herbicidal percentage (%) 22 319 2000 50 1/0.06 85.1 23 2000 100 1/0.12 89.3 24 2000 500 1/0.6 92.1 25 2000 1000 1/1.2 98.5 26 2000 5000 1/6 99.5 27 2000 10000 1/12 99.0 28 2000 30000 1/37 98.1 29 323 2000 50 1/0.06 88.2 30 2000 100 1/0.12 90.0 31 2000 500 1/0.6 93.4 32 2000 1000 1/1.2 97.2 33 2000 5000 1/6 99.7 34 2000 10000 1/12 97.5 35 2000 30000 1/37 95.8 36 343 2000 50 1/0.06 84.9 37 2000 100 1/0.12 88.5 38 2000 500 1/0.6 93.0 39 2000 1000 1/1.2 98.0 40 2000 5000 1/6 99.8 41 2000 10000 1/12 97.2 42 2000 30000 1/37 97.0 43 - 2000 0 - 71.3 Example 18 The same test as the one effected in Reference Example 3 was carried out by using a Sumithion emulsion as an insecticide, and the enhancers 304, 311, 322 and 327 of Example 13 as enhancers each in the amount as specified in Tables 50 and 51. The results are given in Tables 50 and 51. Test No. Enhancer No. Insecticide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./ enhancer concn. by wt. Insecticidal ratio (%) 1 304 250 10 1/0.08 86.7 2 250 25 1/0.2 90.0 3 250 250 1/2 93.3 4 250 1000 1/8 96.7 5 250 2500 1/20 96.7 6 250 5000 1/40 93.3 7 311 250 10 1/0.08 83.3 8 250 25 1/0.2 90.0 9 250 250 1/2 96.7 10 250 1000 1/8 100 11 250 2500 1/20 100 12 250 5000 1/40 96.7 Test No. Enhancer No. Insecticide concn. (ppm) Enhancer concn. (ppm) Agricultural chemical concn./ enhancer concn. by wt. Insecticidal ratio (%) 13 322 250 10 1/0.08 86.7 14 250 25 1/0.2 90.0 15 250 250 1/2 93.3 16 250 1000 1/8 96.7 17 250 2500 1/20 96.7 18 250 5000 1/40 93.3 19 327 250 10 1/0.08 86.7 20 250 25 1/0.2 93.3 21 250 250 1/2 96.7 22 250 1000 1/8 100 23 250 2500 1/20 100 24 250 5000 1/40 96.7 25 - 250 0 - 43.3

Claims: An agricultural chemical composition comprising an agricultural chemical and an effective amount for enhancing the effectiveness of the agricultural chemical of an enhancer compound selected from the group consisting of compounds represented by the following formulae (B) to (F): wherein R 1b and R 2b may be the same or different from each other and each represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 3b and R 4b may be the same or different from each other and each represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group; each of R 5b s and R 6b s represents a hydrogen atom or a methyl group; t and u may be the same or different from each other and each represents a positive number of from 1 to 5; and v and w may be the same or different from each other and each represents a number of from 0 to 30, wherein R 7c and R 8c may be the same or different from each other and each represents an alkyl group having 1 to 4 carbon atoms; R 9c represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms; R 10c and R 11c may be the same or different from each other and each represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group; each of R 12c s and R 13c s represents a hydrogen atom or a methyl group; j and k may be the same or different from each other and each represents a positive number of from 1 to 5; r and s may be the same or different from each other and each represents a number of from 0 to 30; and X - represents a counter ion, wherein R 1d represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 2d represents a linear or branched alkyl or alkenyl group having 1 to 36 carbon atoms which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4d (wherein R 4d represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5d represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6d s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7d represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8d s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); and R 3d represents a group represented by the formula: (wherein R 9d represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 10d s represents a hydrogen atom or a methyl group, G 3 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, h represents a positive number of 2 to 6, i represents a positive number of 1 to 5, and x represents a number of 0 to 30) or a group represented by the formula: (wherein R 11d represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 12d s represents a hydrogen atom or a methyl group, y represents a positive number of 1 to 5, and z represents a number of 0 to 30), wherein R e represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 1e represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 2e represents a linear or branched alkyl or alkenyl group having 1 to 36 carbon atoms which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4e (wherein R 4e represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5e represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6e s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7e represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8e s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); R 3e represents a group represented by the formula: (wherein R 9e represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 10e s represents a hydrogen atom or a methyl group, G 3 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, h represents a positive number of 2 to 6, i represents a positive number of 1 to 5, and x represents a number of 0 to 30) or a group represented by the formula: (wherein R 11e represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 12e s represents a hydrogen atom or a methyl group, y represents a positive number of 1 to 5, and z represents a number of 0 to 30); and X - represents a counter ion, and wherein R 13f represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 14f represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 15f represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group; R 16f represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group; d is a positive number of 1 to 5; and X - is a counter ion. An agricultural chemical composition according to claim 1, wherein the enhancer compound is a compound of formula (B) or (C). An agricultural chemical composition according to claim 1, wherein the enhancer compound is a compound of formula (D), (E) or (F). An agricultural chemical composition according to claim 1, wherein the weight ratio of the compound(s) represented by the above formulae (B) to (F) to the agricultural chemical(s) is from 0.05 to 50. An agricultural chemical composition according to claim 4, wherein the weight ratio of the compound(s) represented by the above general formulae (B) to (F) to the agricultural chemical(s) is from 0.1 to 10. An agricultural chemical composition according to claim 1, wherein the agricultural chemical is a fungicide, an insecticide, a miticide, a herbicide or a plant growth regulator. An agricultural chemical composition according to claim 1, which further comprises a surfactant other than the compounds represented by the formulae (B) to (F). An agricultural chemical composition according to claim 7, wherein the surfactant is a nonionic surfactant. An agricultural chemical composition according to claim 1, wherein the weight ratio of the compound(s) represented by the above formulae (B) to (F) to the surfactant(s) other than the compounds represented by the above formulae (B) to (F) is from 1/10 to 50/1. An agricultural chemical composition according to claim 1, wherein R 1b and R 2b in formula (B) may be the same or different from each other and each represents an alkyl group having 1 to 4 carbon atoms; R 9c in formula (C) represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; R 2d in formula (D) represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4d (wherein R 4d represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5d represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6d s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7d represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8d s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); R e in formula (E) represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 2e in formula (E) represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4e (wherein R 4e represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5e represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6e s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7e represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8e s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO-or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); R 13f in formula (F) represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group. An agricultural chemical composition according to claim 10, wherein the enhancer compound is selected from compounds of formula (B) or (C). An agricultural chemical composition according to claim 10, wherein the enhancer compound is selected from compounds of formula (D), (E) or (F). A method for enhancing the effectiveness of an agricultural chemical which comprises applying an enhancer compound selected from the group consisting of compounds represented by the following formulae (B) to (F) with an agricultural chemical to a locus which would benefit from such treatment: wherein R 1b and R 2b may be the same or different from each other and each represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 3b and R 4b may be the same or different from each other and each represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group; each of R 5b s and R 6b s represents a hydrogen atom or a methyl group; t and u may be the same or different from each other and each represents a positive number of from 1 to 5; and v and w may be the same or different from each other and each represents a number of from 0 to 30, wherein R 7c and R 8c may be the same or different from each other and each represents an alkyl group having 1 to 4 carbon atoms; R 9c represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms; R 10c and R 11c may be the same or different from each other and each represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group; each of R 12c s and R 13c s represents a hydrogen atom or a methyl group; j and k may be the same or different from each other and each represents a positive number of from 1 to 5; r and s may be the same or different from each other and each represents a number of from 0 to 30; and X - represents a counter ion, wherein R 1d represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 2d represents a linear or branched alkyl or alkenyl group having 1 to 36 carbon atoms which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4d (wherein R 4d represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5d represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6d s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7d represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8d s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); and R 3d represents a group represented by the formula: (wherein R 9d represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 10d s represents a hydrogen atom or a methyl group, G 3 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, h represents a positive number of 2 to 6, i represents a positive number of 1 to 5, and x represents a number of 0 to 30) or a group represented by the formula: (wherein R 11d represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 12d s represents a hydrogen atom or a methyl group, y represents a positive number of 1 to 5, and z represents a number of 0 to 30), wherein R e represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbons atoms which may be substituted with a hydroxyl group; R 1e represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 2e represents a linear or branched alkyl or alkenyl group having 1 to 36 carbon atoms which may be substituted with a hydroxyl group, a group represented by the formula: -C a H 2a -(G 1 )-R 4e (wherein R 4e represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group, G 1 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, and a represents a positive number of 2 to 6), a group represented by the formula: (wherein R 5e represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 6e s represents a hydrogen atom or a methyl group, b represents a positive number of 1 to 5, and c represents a number of 0 to 30) or a group represented by the formula: (wherein R 7e represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 8e s represents a hydrogen atom or a methyl group, G 2 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, e represents a positive number of 2 to 6, f represents a positive number of 1 to 5 and g represents a number of 0 to 30); R 3e represents a group represented by the formula: (wherein R 9e represents a linear or branched alkyl or alkenyl group having 4 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 10e s represents a hydrogen atom or a methyl group, G 3 represents a group represented by the formula: -OCO- or a group represented by the formula: -NHCO-, h represents a positive number of 2 to 6, i represents a positive number of 1 to 5, and x represents a number of 0 to 30) or a group represented by the formula: (wherein R 11e represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group, each of R 12e s represents a hydrogen atom or a methyl group, y represents a positive number of 1 to 5, and z represents a number of 0 to 30); and X - represents a counter ion, and wherein R 13f represents a hydrogen atom, a benzyl group or an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 14f represents an alkyl group having 1 to 4 carbon atoms which may be substituted with a hydroxyl group; R 15f represents a linear or branched alkyl or alkenyl group having 6 to 36 carbon atoms which may be substituted with a hydroxyl group; R 16f represents a linear or branched alkyl or alkenyl group having 5 to 36 carbon atoms which may be substituted with a hydroxyl group; d is a positive number of 1 to 5; and X - is a counter ion. The method according to claim 13, wherein the enhancer and the agricultural chemical are diluted with water or a liquid carrier before applying. The method according to claim 13, wherein an appropriate amount of a surfactant other than the compounds represented by the above formulae (B) to (F) is further added to the composition comprising the agricultural chemical. The method according to claim 15, wherein the surfactant is a nonionic surfactant. The method according to claim 15, wherein the weight ratio of the compound(s) represented by the above formulae (B) to (F) to the surfactant(s) other than the compounds represented by the formulae (A) to (B) is from 1/10 to 50/1. The method according to claim 13, wherein the weight ratio of the compound(s) represented by the above formulae (B) to (F) to the agricultural chemical(s) is from 0.05 to 50. The method according to claim 18, wherein the weight ratio of the compound(s) represented by the above formulae (B) to (F) to the agricultural chemical is from 0.1 to 10. The method according to claim 13, wherein the agricultural chemical is a fungicide, an insecticide, a miticide, a herbicide or a plant growth regulator. Use of a compound selected from compounds of the formulae (B) to (F) as defined in claim 1 for the preparation of an agricultural chemical composition. An agricultural chemical kit which comprises a container containing the enhancer compound as set forth in claim 1 and a container containing an agricultural chemical. An agricultural chemical kit which comprises a container containing an enhancer compound as set forth in claim 1, a container containing a surfactant other than the compounds represented by the formulae (B) to (F) as defined in claim 1 and a container containing an agricultural chemical.

Inventors: HASEBE KEIKO, HIROKI YUICHI, KATOH TOHRU, NISHIMOTO UICHIRO, NISHIMOTO YOSHIFUMI, OHTAWA YASUKI, SOTOYA KOHSHIRO, SUZUKI TADAYUKI, TACHIZAWA OSAMU, TOMIFUJI TAKESHI, TOMIOKA KEIICHIRO, HASEBE, KEIKO, HIROKI, YUICHI, KATOH, TOHRU, NISHIMOTO, UICHIRO, NISHIMOTO, YOSHIFUMI, OHTAWA, YASUKI, SOTOYA, KOHSHIRO, SUZUKI, TADAYUKI, TACHIZAWA, OSAMU, TOMIFUJI, TAKESHI, TOMIOKA, KEIICHIRO, Tomifuji, Takeshi C/O Kao Corporation
Applicants: KAO CORP, KAO CORPORATION
Application year: 1994
Main classification: A01N25
IPC codes: A01N37, A01N25